题目：

Graphene−Bi2Te3 Heterostructure as Saturable Absorber for Short Pulse Generation

作者：

Haoran Mu,^†,§ Zhiteng Wang,^‡,§ Jian Yuan,^†,§ Si Xiao,^∥ Caiyun Chen,^† Yu Chen,^‡ Yao Chen,^† Jingchao Song,^⊥ Yusheng Wang,^† Yunzhou Xue,^† Han Zhang,^*,‡ and Qiaoliang Bao^*,†,⊥

单位：

^†Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123,People’s Republic of China  

^‡SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, People’s Republic of China ^∥Institute of Super-Microstructure and Ultrafast Process in Advanced Materials, School of Physics and Electronics, Hunan Key Laboratory for Super-Microstructure and Ultrafast Process, Central South University, Changsha 410083, People’s Republic of China  

^⊥Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia

摘要：

Rapid progresses have been achieved in the photonic applications of two-dimensional materials such as graphene, transition metal dichalcogenides, and topological insulators. The strong light−matter interactions and largeoptical nonlinearities in these atomically thin layered materials make them promising saturable absorbers for pulsed laser applications. Either Q-switching or mode-locking pulses with particular output characteristics can be achieved by using different saturable absorbers. However, it remains still very challenging to produce saturable absorbers with tunable optical properties, in particular, carrier dynamics, saturation intensityas well as modulation depth, to suit for self-starting, high energy or ultrafast pulse laser generation. Here we report anew type of saturable absorber which is a van der Waals heterostructure consisting of graphene and Bi2Te3. The synergetic integration of these two materials by epitaxial growth affords tunable optical properties, that is, both the photo carrier dynamics and the nonlinear optical modulation are variable by tuning the coverage of Bi2Te3 on graphene. We further fabricatedgraphene−Bi2Te3 saturable absorbers and incorporated them into a 1.5 μmfiber laser to demonstrate both Q-switching and mode-locking pulse generation. This work provides a new insight for tailoring two-dimensional heterostructures so as to develop desired photonic applications.

影响因子：

分区情况：

新期刊

链接：

http://pubs.acs.org/doi/abs/10.1021/acsphotonics.5b00193